package com.zhou.util;


/**
 * AES 128bit 加密解密工具类
 *
 */

import lombok.SneakyThrows;
import org.apache.commons.codec.binary.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;


public class AESUtil {

    //使用AES-128-CBC加密模式，key需要为16位,key和iv可以相同！
    private static String KEY = "1234567890123456";

    private static String IV = "1234567890123456";


    /**
     * 加密方法
     * @param data  要加密的数据
     * @param key 加密key
     * @param iv 加密iv
     * @return 加密的结果
     * @throws Exception
     */
    public static String encrypt(String data, String key, String iv) throws Exception {
        try {

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");//"算法/模式/补码方式"NoPadding PkcsPadding
            int blockSize = cipher.getBlockSize();

            byte[] dataBytes = data.getBytes();
            int plaintextLength = dataBytes.length;
            if (plaintextLength % blockSize != 0) {
                plaintextLength = plaintextLength + (blockSize - (plaintextLength % blockSize));
            }

            byte[] plaintext = new byte[plaintextLength];
            System.arraycopy(dataBytes, 0, plaintext, 0, dataBytes.length);

            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
            byte[] encrypted = cipher.doFinal(plaintext);

            return new Base64().encodeToString(encrypted);

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 解密方法
     * @param data 要解密的数据
     * @param key  解密key
     * @param iv 解密iv
     * @return 解密的结果
     * @throws Exception
     */
    public static String desEncrypt(String data, String key, String iv) throws Exception {
        try {
            byte[] encrypted1 = new Base64().decode(data);

            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            SecretKeySpec keyspec = new SecretKeySpec(key.getBytes(), "AES");
            IvParameterSpec ivspec = new IvParameterSpec(iv.getBytes());

            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);

            byte[] original = cipher.doFinal(encrypted1);
            String originalString = new String(original);
            return originalString.trim();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 使用默认的key和iv加密
     * @param data
     * @return
     * @throws Exception
     */
    @SneakyThrows
    public static String encrypt(String data){
        return encrypt(data, KEY, IV);
    }

    /**
     * 使用默认的key和iv解密
     * @param data
     * @return
     * @throws Exception
     */
    public static String desEncrypt(String data) throws Exception {
        return desEncrypt(data, KEY, IV);
    }

    static String  se = "MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAK19RIbUIAhviZ+xLFt5A6Ol0/yp162y\n" +
            "tvdzjrVpM6velIEMRGB1LzQA5T6QbRQvdoBPckplIu+IfhICseNHbRUCAwEAAQ==";
    /**
     * 测试
     */
    public static void main(String[] args) throws Exception {
        // 加密
        System.out.println("加密后：" + encrypt(se, KEY, IV));
        // 加密
        System.out.println("解密后：" + desEncrypt(encrypt(se, KEY, IV), KEY, IV));
        System.out.println("解密后：" + desEncrypt("y3BJ39GFbukJzcjWGQ1EliG2rWNMI0hirV0CAeMmdvlAsrR//Jzg30C9JKsYjuTE7J0HbhRyD6C7/BtJ7yh4kA==", KEY, IV));
    }

}
